Underwater efficient bidirectional self-adaptive turbine hub and assembly method thereof

The underwater efficient bidirectional self-adaptive turbine hub comprises a hub body, a blade rotating shaft and a first limiting rotating structure or a second limiting rotating structure, a plurality of blade rotating holes are evenly distributed in the circumferential direction of the hub body at intervals, and the blade rotating holes are formed in the radial direction and point to the center of the hub body; a blade rotating shaft is arranged in each blade rotating hole, one end of each blade rotating shaft is rotationally connected with the hub body, the rotating angle of each blade rotating shaft is limited through a first limiting rotating structure or a second limiting rotating structure, and a blade is installed at the other end of each blade rotating shaft. The invention further discloses an assembling method. Two limiting modes are provided for limiting the variable pitch angle, the capturing efficiency of tidal current energy or wave energy is improved, the self-adaptive response speed is increa